On 05/20, Ævar Arnfjörð Bjarmason wrote:
> Factor the test for \0 in grep patterns into a function. Since commit
> 9eceddeec6 ("Use kwset in grep", 2011-08-21) any pattern containing a
> \0 is considered fixed as regcomp() can't handle it.
>
> This change makes later changes that make use of either has_null() or
> is_fixed() (but not both) smaller.
>
> While I'm at it make the comment conform to the style guide, i.e. add
> an opening "/*\n".
>
> Signed-off-by: Ævar Arnfjörð Bjarmason <ava...@gmail.com>
> ---
> grep.c | 20 +++++++++++++-------
> 1 file changed, 13 insertions(+), 7 deletions(-)
>
> diff --git a/grep.c b/grep.c
> index bf6c2494fd..79eb681c6e 100644
> --- a/grep.c
> +++ b/grep.c
> @@ -321,6 +321,18 @@ static NORETURN void compile_regexp_failed(const struct
> grep_pat *p,
> die("%s'%s': %s", where, p->pattern, error);
> }
>
> +static int has_null(const char *s, size_t len)
> +{
> + /*
> + * regcomp cannot accept patterns with NULs so when using it
> + * we consider any pattern containing a NUL fixed.
> + */
> + if (memchr(s, 0, len))
> + return 1;
> +
> + return 0;
> +}
> +
> #ifdef USE_LIBPCRE
> static void compile_pcre_regexp(struct grep_pat *p, const struct grep_opt
> *opt)
> {
> @@ -394,12 +406,6 @@ static int is_fixed(const char *s, size_t len)
> {
> size_t i;
>
> - /* regcomp cannot accept patterns with NULs so we
> - * consider any pattern containing a NUL fixed.
> - */
> - if (memchr(s, 0, len))
> - return 1;
> -
> for (i = 0; i < len; i++) {
> if (is_regex_special(s[i]))
> return 0;
> @@ -451,7 +457,7 @@ static void compile_regexp(struct grep_pat *p, struct
> grep_opt *opt)
> * simple string match using kws. p->fixed tells us if we
> * want to use kws.
> */
> - if (opt->fixed || is_fixed(p->pattern, p->patternlen))
> + if (opt->fixed || has_null(p->pattern, p->patternlen) ||
> is_fixed(p->pattern, p->patternlen))
small nit: longer than 80 char
> p->fixed = !icase || ascii_only;
> else
> p->fixed = 0;
> --
> 2.13.0.303.g4ebf302169
>
--
Brandon Williams
